Leases - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) Lease Facility	Dec. 31, 2018 USD ($)
Lessee Lease Description [Line Items]
Operating leases expiration date	2028
Number of subleases	5
Number of facilities leased | Facility	4
Asset impairment | $	$ 612
Number of leases related to ongoing operations	11
Number of leases related to Closed campuses	3
Continuing Operation [Member]
Lessee Lease Description [Line Items]
Rent expense, exclusive of related taxes,insurance and maintenance costs | $		$ 15,500
Minimum [Member]
Lessee Lease Description [Line Items]
Lease term range, years	5 years
Number of renewal options for extended terms	1 year
Operating sublease term	1 year
Maximum [Member]
Lessee Lease Description [Line Items]
Lease term range, years	10 years
Number of renewal options for extended terms	4 years
Operating sublease term	3 years